I found it in the /etc directory of my Ubuntu 12.4 partition. This doesn't block it at the router but at least the computer is safe. This list belongs in the room's info file.
# The following lines are desirable for IPv6 capable hosts
::1 ip6-localhost ip6-loopback
# Block Facebook
#somebody please think of the children.
I don't use adblock. I have been using the EFF's Privacy Badger, which seems to block the most annoying ads. I pair that with Ghostry. Between the two I don't see too many ads.
I felt guilty and turned it off. If I could financially harm the record companies instead of Pandora, I'd definitely keep it on.